1-3If an alias is configured for a domain name on the DNS server, the device can resolve the alias into theIP address of the host.DNS ProxyIntroduction to DNS proxyA DNS proxy forwards DNS requests and replies between DNS clients and a DNS server.As shown in Figure 1-2, a DNS client sends a DNS request to the DNS proxy, which forwards therequest to the designated DNS server, and conveys the reply from the DNS server to the client.The DNS proxy simplifies network management. When the DNS server address is changed, you onlyneed to change the configuration on the DNS proxy instead of on each DNS client.Figure 1-2 DNS proxy networking applicationOperation of a DNS proxy1) A DNS client considers the DNS proxy as the DNS server, and sends a DNS request to the DNSproxy, that is, the destination address of the request is the IP address of the DNS proxy.2) The DNS proxy searches the local static domain name resolution table after receiving the request.If the requested information exists in the table, the DNS proxy returns a DNS reply to the client.3) If the requested information does not exist in the static domain name resolution table, the DNSproxy sends the request to the designated DNS server for domain name resolution.4) After receiving a reply from the DNS server, the DNS proxy forwards the reply to the DNS client.
